MainActivity.kt
package com.cfsuman.kotlinexamples
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// Get the widgets reference from xml layout
val textView = findViewById<TextView>(R.id.text_view)
val button = findViewById<Button>(R.id.button);
val button2 = findViewById<Button>(R.id.button2);
val button3 = findViewById<Button>(R.id.button3);
val button4 = findViewById<Button>(R.id.button4);
// Initialize some integer type variables
var a:Int = 5
var b:Int = 10
var c:Int = 8
// Traditional if statement
button.setOnClickListener{
var max = a
if(a < b) max = b
textView.text = "From $a and $b, biggest number is $max"
}
// If with else statement
button2.setOnClickListener{
var max:Int
if(a > b){
max = a
textView.text = "$max is biggest number in $a and $b"
}else{
max = b
textView.text = "$max is biggest number in $a and $b"
}
}
// If else if statement
button3.setOnClickListener{
var max:Int
if(a > b && a > c){
max = a
textView.text = "$max is biggest number from $a and $b and $c"
}else if (b > a && b > c){
max = b
textView.text = "$max is biggest number from $a and $b and $c"
}else{
max = c
textView.text = "$max is biggest number from $a and $b and $c"
}
}
// If as expression
button4.setOnClickListener{
// If else in one line
var max = if(a > b) a else b
textView.text = "$max is biggest number from $a and $b"
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="If Statement"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="If Else Statement"
/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="If Else If Statement"
/>
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="If As Expression"
/>
<TextView
android:id="@+id/text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:textSize="23sp"
android:textStyle="bold"
android:textColor="#ff191d"
android:layout_marginTop="20dp"
/>
</LinearLayout>




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